Modeling of Glide-Symmetric Dielectric Structures

Abstract

Recently, there has been an increased interest in exploring periodic structures having higher symmetry properties, primarily based on metallic realization. The design of dielectric glide-symmetric structures has many challenges, and this paper presents a systematic analysis approach based on Floquet mode decomposition and mode matching technique. The presented procedure connects the analysis of standard periodic structures and glide-symmetric realizations, thus giving insight into the wave propagation and interaction characteristics. The obtained results were verified in comparison with results from known references and using a commercial solver, proving that the proposed analysis technique is inherently accurate, and the degree of accuracy depends only on the number of modes used. The proposed analysis approach represents the first step in the design process of dielectric periodic structures with glide symmetry.

On the Benefits of Glide Symmetries for Microwave Devices

“…In addition to the multimode transfer-matrix analysis, other modelling methods can be useful to obtain complementary physical insight. In particular, a mode matching [49] with a formulation adapted for glide-symmetric unit cells has been proposed to study structures embedded in metallic or dielectric waveguides [19], [20], [50]- [53]. A simple description of the approach can be given with reference to Fig.…”

High Refractive Index Electromagnetic Devices in Printed Technology Based on Glide-Symmetric Periodic Structures

“…Additionally, glide-symmetric holey structures have been used to suppress the leakage between waveguide flanges, which enables contact-less measurements of electromagnetic devices [42]. The attractive properties found in higher-symmetric structures have inspired several works on numerical methods for the analysis [16,[43][44][45][46][47][48][49][50]. These methods also give valuable physical insight.…”

Periodic Structures With Higher Symmetries: Their Applications in Electromagnetic Devices

“…Although at first glance there are a lot of similarities between the analysis of metallic and dielectric glide-symmetric structures, the main difference comes from the fact that in the dielectric case part of the propagating wave (and thus part of the electromagnetic power) travels outside the dielectric waveguide. The wave propagating in the corrugated region can be modeled as a wave propagating along a periodic array of dielectric slabs, and it has to be matched at both interfaces with the modes present in PPW and in free-space, respectively [36]. For propagation constants smaller than the one of free-space, a fast wave is excited, which leads to leakage of electromagnetic energy (i.e., the considered structure actually represents a leaky-wave antenna).…”